POC: use agent push GH action to publish tax man to agent api

[wall-rl]

No description provided.

[wall-rl]

I coded this in late november and forgot to push PR -- not sure we need this now but this is intention of agent api and GH action.

[wall-rl]

This is not correct, but is copied from where we use this in a claude agent w/ skills.

[jrvb-rl]

The current taxman uses the codex API, and sets up a blueprint with the relevant code and libraries pre-installed. If we want taxman to use the agent API, we will want to change that around as well.

If doing this is useful for figuring out ergonomics for the agent API and orchestrator stuff, then it makes sense to modify taxman to exercise these. If not, we can leave the taxman alone for now to reduce drift from the video content.